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haelix

Member

Registered: 2021-05-19

Posts: 7

[SOLVED] have no core files generated despite seemingly good config

I read https://wiki.archlinux.org/title/Core_d … do_they_go?

AFAIK I'm using the defaults all the way.

cat /proc/sys/kernel/core_pattern
|/usr/lib/systemd/systemd-coredump %P %u %g %s %t %c %h

cat /proc/sys/kernel/core_uses_pid
1

cat /etc/systemd/coredump.conf
[Coredump]
#Storage=external
#Compress=yes
#ProcessSizeMax=2G
#ExternalSizeMax=2G
#JournalSizeMax=767M
#MaxUse=
#KeepFree=

The section [Coredump] is all commented, I'd expect those should be the defaults. Storage=external should send cores to /var/lib/systemd/coredump/ but which is empty.

coredumpctl list    -> tells me all cores files are "missing"

ulimit -c has been "unlimited"

Last edited by haelix (2022-04-18 22:05:37)

ewaller

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From: Pasadena, CA

Registered: 2009-07-13

Posts: 19,772

Re: [SOLVED] have no core files generated despite seemingly good config

What does ls -l /var/lib/systemd/coredump/  have to say?
Is anything mounted on /var ?

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haelix

Member

Registered: 2021-05-19

Posts: 7

Re: [SOLVED] have no core files generated despite seemingly good config

ls -l (or ls -Al for that matter) lists no files at all.
I don't have such mounts.
coredumpctl list gives me a nice list of cores, but all of them are missing, like so:

TIME                            PID  UID  GID SIG     COREFILE EXE                                                                                                             SIZE
Sat 2021-02-27 12:16:59 GMT     776 1000 1000 SIGABRT missing  /usr/bin/gnome-flashback                                                                                         n/a
Sat 2021-02-27 12:17:04 GMT   79637 1000 1000 SIGABRT missing  /usr/bin/gnome-flashback                                                                                         n/a
Sat 2021-02-27 12:17:05 GMT   79670 1000 1000 SIGABRT missing  /usr/bin/gnome-flashback                                                                                         n/a

Trilby

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Registered: 2011-11-29

Posts: 29,523

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Re: [SOLVED] have no core files generated despite seemingly good config

Are those the most recent?  That's over a year ago.  Systemd-tmpfiles is set to remove old core dumps, I believe the default may be to remove any that are over 3 days old.

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haelix

Member

Registered: 2021-05-19

Posts: 7

Re: [SOLVED] have no core files generated despite seemingly good config

Yep, they're missing.

Tue 2022-03-22 17:57:15 GMT  133376    0    0 SIGSEGV missing  /usr/bin/lightdm                                                                                                 n/a
Tue 2022-03-22 17:57:19 GMT  133409    0    0 SIGSEGV missing  /usr/bin/lightdm                                                                                                 n/a
Tue 2022-03-22 17:57:24 GMT  133442    0    0 SIGSEGV missing  /usr/bin/lightdm                                                                                                 n/a
Sun 2022-03-27 15:15:46 BST  133069 1000 1000 SIGABRT missing  /usr/lib/jvm/java-17-openjdk/bin/java                                                                            n/a
Sat 2022-04-02 15:23:29 BST    1938 1000 1000 SIGTRAP missing  /opt/google/chrome/chrome                                                                                        n/a
Sat 2022-04-02 15:24:29 BST    2083 1000 1000 SIGTRAP missing  /opt/google/chrome/chrome                                                                                        n/a
Sat 2022-04-02 15:35:06 BST    2440 1000 1000 SIGTRAP missing  /opt/google/chrome/chrome                                                                                        n/a
Sat 2022-04-02 16:01:34 BST    7569 1000 1000 SIGTRAP missing  /opt/google/chrome/chrome                                                                                        n/a
Sun 2022-04-03 21:02:36 BST   71518 1000 1000 SIGABRT missing  /usr/lib/jvm/java-17-openjdk/bin/java                                                                            n/a
Mon 2022-04-11 22:26:55 BST   17510 1000 1000 SIGABRT missing  /usr/lib/jvm/java-17-openjdk/bin/java                                                                            n/a
Tue 2022-04-12 21:42:56 BST   40039 1000 1000 SIGABRT missing  /usr/lib/jvm/java-17-openjdk/bin/java                                                                            n/a

Trilby

Inspector Parrot

Registered: 2011-11-29

Posts: 29,523

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Re: [SOLVED] have no core files generated despite seemingly good config

Ok, those are newer, but all still well over 3 days old.  So why is it odd that they are missing?  What's the output of the following:

systemd-tmpfiles --cat-config | grep coredump

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"UNIX is simple and coherent..." - Dennis Ritchie, "GNU's Not UNIX" -  Richard Stallman

haelix

Member

Registered: 2021-05-19

Posts: 7

Re: [SOLVED] have no core files generated despite seemingly good config

3 days you say?

systemd-tmpfiles --cat-config | grep coredump
# Handle lost systemd-coredump temp files. They could be lost on old filesystems,
x  /var/lib/systemd/coredump/.#core*.%b*
r! /var/lib/systemd/coredump/.#*
d /var/lib/systemd/coredump 0755 root root 3d

I guess that's what's deleting them then?

Trilby

Inspector Parrot

Registered: 2011-11-29

Posts: 29,523

Website

Re: [SOLVED] have no core files generated despite seemingly good config

Yes.  The last line of that output includes an age field of '3d', anything older than that is removed every time the systemd-tmpfiles service runs (which is daily with the default timer).  If you want to keep older core dumps, this is all configurable - but right now everything you are showing looks like the default configurations and so the results you are seeing are exactly as would be expected.

Last edited by Trilby (2022-04-18 21:19:15)

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"UNIX is simple and coherent..." - Dennis Ritchie, "GNU's Not UNIX" -  Richard Stallman

haelix

Member

Registered: 2021-05-19

Posts: 7

Re: [SOLVED] have no core files generated despite seemingly good config

Thanks, that clears it up then.

Slithery

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From: Norfolk, UK

Registered: 2013-12-01

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Re: [SOLVED] have no core files generated despite seemingly good config

Please remember to mark the thread as [SOLVED].
CoC - How to post

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